O(n * m)

How?

i wanted to do this but couldnt figure the logic out. nice solution tho

this was my solution!

Pienso que tu solucion se podria mejorar haciendo una copia de a en vez de modificarla

This helped me as well. Thank you for the explanation. I ended scrapping the the use of splice() simply becuase i couldnt figure that out. ended up just deleting the element in the list using delete and using filter to filter out falsy values that were not === 0 till i got what was needed. This was helpful to understand though. Thanks again